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Component identification - help needed

Hi guys. Help needed with 2 things:

1) there are 3 components on Asus Tinker Board S in the middle of the board (check pics attached). As you can see I need to replace one of those. What are they? (marked as CJ)

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2) also now I see that this part is shorted - which correlates with around 4-5 Ohm resistance I see on the nearby caps - what is this chip marked C4C?

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Here's the schematic for the board, but I can't quite figure it out myself. Thanks a lot in advance!

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@jayeff @insympathy don't mean to hijack this or to butt in but we can't post attachments in comments :-) I concur with the above finding. If you look at your posted image, the marking contains a funny looking "t" which is the symbol for Nexperia. That combined with the "S72" sure looks like a NX7002AK2 Here is the datasheet NX7002AK and it is available at places like this and others.

QFN and VDFN packages have no visible leads and the contacts are on the outer edges of the IC. On your picture it looks like it does have leads then it would be more like a SNT-8A. is there another contact on the left hand side of the component (by that interrupted blue line)?

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Hey, thanks a lot for your help - really appreciate it.

As for the NX7002AK2 - it has 8 pins - 4 on each side plus a center contact. It measures 2x2mm. So far I’ve been all over Mouser and Digikey and AliExpress but can’t find it in anything close to that.

I’ve added a picture of it to the original post

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@insympathy that is the IC marked as C4C correct? That is not a NX7002AK2. Those are shown in your second picture.

As for the C4C that is a QFD package (or derivative there off) since no leads are visible and the contacts are on the outside margin of the bottom side it looks like a DFN2020-8 package. Let's see if we can figure out what we got there. Start off by checking on here and see if that gets you started. I would also suggest you post a question with the pro's on here We'll keep on trying to identify this IC for you as well.

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@oldturkey03 awesome, thanks a lot, really appreciate your help!

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@oldturkey03 that's a really impressive list of C4 related components, sadly I didn't see any that would match. Will later ask on that forum, so thanks again for sharing!

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thanks to amazing people at Digikey we now know that this C4C is actually NCP6324, NCV6324, NCV6324BMTAATBG 🙌

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Hi @insympathy

To get you started, the components in the 1st image (you marked CJ?) have an S72 code on their case which is an N-Channel Mosfet.

An example is Q3501 on the schematic you posted. It shows it is an NX7002AK2 which is also an N-Channel Mosfet.

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awesome, thanks a lot! I wish someday I'd get that good at reading schematics :))

as for the first mosfets - are they 2SB815-7-TB-E? And also if I don't have that exact mosfet - can I replace it with DMG1012T (NA1) for example?

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and one more question: what is the package name for this NX7002AK2? It's around 2mmx2mm, has 8 pins and a large center pad. Is it VDFN? QFN?

Can it also be replaced with another N-Channel Mosfet?

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@insympathy

As I don't know where they are located on the board the NX7002AK2 was only 1 example of a Mosfet on the board.

The S72 was how to identify the type of component. It is an N-channel Mosfet in an SOT-23 smd package

There are others e.g. PQ8201 A & B they are a pmdxb600une but since I don't know where they're located I don't know what type of package they come in.

You would really need to find a board view file for the board to know the ID of the components and then locate them in the schematic and then note what their model/type is and then try to find them in the same package

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@jayeff understood, thanks a lot

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